Learn how to Deactivate Facebook Account Permanently Immediately here on Learn Facebook Basics: Understand that deactivating your Facebook account implies that you no longer want to use the Facebook account in question again or at least not for the mean time. When you want to join Facebook account again - after deactivating FB account, all you need to do is to login to your Facebook account with the correct password and email/phone number - and your account will be reactivated!